The first oil change is generally recommended for 2000 ~ 4000km, and the usual oil change is recommended for 20,000 ~ 25,000km.
Base oil or synthetic lubricating oil is an important lubricating oil prepared by adding extreme pressure anti-wear agent and oily agent. It is used in various gear transmissions to prevent tooth surface wear, abrasion, sintering, etc., extend its service life, and improve power transmission efficiency.
Gear oil should have good abrasion resistance, load resistance and suitable viscosity. In addition, it should have good thermal oxidation stability, foam resistance, water separation performance and rust prevention performance.
Because the gear load is generally above 490 MPa (MPa), and the hyperbola tooth surface load is up to 2942 MPa, in order to prevent tooth surface wear and abrasion caused by oil film rupture, extreme pressure antiwear agents are often added to gear oil, and sulfur is generally used -Phosphorus or sulfur-phosphorus-nitrogen type additives. In addition, a higher viscosity index can reduce the viscosity of oil products due to temperature and adapt to a wider range of operating temperatures. Due to different sources of base oils, in the GB5903-1995 standard, medium-viscosity index MVI base oils are used to modulate L-CKC medium-load gear oils. The allowable viscosity index is not less than 70, and paraffin-based base oils with higher viscosity indexes are not less than 90. However, many users have not noticed this, and it is inevitable that the viscosity index of the product prepared by MVI base oil is unqualified.